Currently, in the front-end, we have a wave gif file and we want this to be real now. So find a good plugin that will visualize sound. I found this one: (https://pub.dev/packages/flutter_visualizers), however, there might be nicer and better solutions.
You can possibly can tap into e.decibels found in recorder.dart since that is already saving a double value for decibels from the recording.
DONE:
You are able to record and see the visualizer portray the sound based off your the sound level of your speech.
WHAT TO DO:
DONE: